<?php
/*
 *	长文章 自动/手动 分页类
 *	@package	cutpage
 *	@author		yytcpt(无影)
 *	@version	2008-03-27
 *	@copyrigth	http://www.d5s.cn/ 
 */
	class cutpage{
		var $pagestr;		//被切分的内容
		var $pagearr;		//被切分文字的数组格式
		var $sum_word;		//总字数(UTF-8格式的中文字符也包括)
		var $sum_page;		//总页数
		var $page_word;		//一页多少字
		var $cut_tag;		//自动分页符
		var $cut_custom;	//手动分页符
		var $ipage;			//当前切分的页数，第几页
		var $url;
		function __construct(){
			$this->page_word = 7000;
			$this->cut_tag = array("</table>", "</div>", "</p>", "<br/>", "”。", "。", ".", "！", "……", "？", ",");
			$this->cut_custom = "{nextpage}";
			$tmp_page = intval(trim($_GET["ipage"]));
			$this->ipage = $tmp_page>1?$tmp_page:1;
		}
		//统计总字数
		function get_page_word(){
			$this->sum_word = $this->strlen_utf8($this->pagestr);
			return $this->sum_word;
		}
		/*	统计UTF-8编码的字符长度
		 *	一个中文，一个英文都为一个字
		 */
		function strlen_utf8($str){
		   $i = 0;
		   $count = 0;
		   $len = strlen ($str);
		   while ($i < $len){
			   $chr = ord ($str[$i]);
			   $count++;
			   $i++;
			   if ($i >= $len)
				   break;
			   if ($chr & 0x80){
				   $chr <<= 1;
				   while ($chr & 0x80) {
					   $i++;
					   $chr <<= 1;
				   }
			   }
		   }
		   return $count;
		}
		//设置自动分页符号
		function set_cut_tag($tag_arr=array()){
			$this->cut_tag = $tag_arr;
		}
		//设置手动分页符
		function set_cut_custom($cut_str){
			$this->cut_custom = $cut_str;
		}
		function show_cpage($ipage=0){
			$this->cut_str();
			$ipage = $ipage ? $ipage:$this->ipage;
			return $this->pagearr[$ipage];
		}
		function cut_str(){
			$str_len_word = strlen($this->pagestr);		//获取使用strlen得到的字符总数
			$i = 0;
			if ($str_len_word<=$this->page_word){	//如果总字数小于一页显示字数
				$page_arr[$i] = $this->pagestr;
			}else{
				if (strpos($this->pagestr, $this->cut_custom)){
					$page_arr = explode($this->cut_custom, $this->pagestr);
				}else{
					$str_first = substr($this->pagestr, 0, $this->page_word);	//0-page_word个文字	cutStr为func.global中的函数
					foreach ($this->cut_tag as $v){
						$cut_start = strrpos($str_first, $v);		//逆向查找第一个分页符的位置
						if ($cut_start){
							$page_arr[$i++] = substr($this->pagestr, 0, $cut_start).$v;
							$cut_start = $cut_start + strlen($v);
							break;
						}
					}
					if (($cut_start+$this->page_word)>=$str_len_word){	//如果超过总字数
						$page_arr[$i++] = substr($this->pagestr, $cut_start, $this->page_word);
					}else{
						while (($cut_start+$this->page_word)<$str_len_word){
							foreach ($this->cut_tag as $v){
								$str_tmp = substr($this->pagestr, $cut_start, $this->page_word);		//取第cut_start个字后的page_word个字符
								$cut_tmp = strrpos($str_tmp, $v);		//找出从第cut_start个字之后，page_word个字之间，逆向查找第一个分页符的位置
								if ($cut_tmp){
									$page_arr[$i++] = substr($str_tmp, 0, $cut_tmp).$v;
									$cut_start = $cut_start + $cut_tmp + strlen($v);
									break;
								}
							}	
						}
						if (($cut_start+$this->page_word)>$str_len_word){
							$page_arr[$i++] = substr($this->pagestr, $cut_start, $this->page_word);
						}
					}
				}
			}
			$this->sum_page = count($page_arr);		//总页数
			$this->pagearr = $page_arr;
		}
		//显示上一条，下一条
		function show_prv_next(){
			$this->set_url();
			if ($this->sum_page>1 and $this->ipage<$this->sum_page){
				$str = "<a href='".$this->url.($this->ipage+1)."'>下一页</a>　";
			}
			if ($this->sum_page>1 and $this->ipage>1){
				$str.= "<a href='".$this->url.($this->ipage-1)."'>上一页</a>";
			}
			return $str;
		}
		function show_page_select(){
			if ($this->sum_page>1){
				$str = " &nbsp; <select onchange=\"location.href=this.options[this.selectedIndex].value\">";
				for ($i=1; $i<=$this->sum_page; $i++){
					$str.= "<option value='".$this->url.$i."' ".(($this->ipage)==$i ? " selected='selected'":"").">第".$i."页</option>";
				}
				$str.= "</select>";
			}
			return $str;
		}

		function show_page_list(){
					$this->set_url();
			if ($this->sum_page>1){
				for ($i=1; $i<=$this->sum_page; $i++){
					if($this->ipage==$i){
					$str.= "&nbsp;<li class=\"on\"><a href=\"#\">".$i."</a></li>&nbsp;";
					}else{
					$str.= "&nbsp;<li><A HREF='".$this->url.$i."'>".$i."</A></li>&nbsp;";
					}
				}
			}
			return "<div class=\"fenye\"><ul>".$str."</ul></div>";
		}
		
	function show_page_select_wap(){
			if ($this->sum_page>1){
				$str = "<select ivalue='".($this->ipage-1)."'>";
				for ($i=1; $i<=$this->sum_page; $i++){
					$str.= "<option onpick='".$this->url.$i."'>第".$i."节</option>";
				}
				$str.= "</select>";
			}
			return $str;
		}
		function set_url(){
			parse_str($_SERVER["QUERY_STRING"], $arr_url);
			unset($arr_url["ipage"]);
			if (empty($arr_url)){
				$str = "ipage=";
			}else{
				$str = http_build_query($arr_url)."&ipage=";
			}
			$this->url = "http://".$_SERVER["HTTP_HOST"].$_SERVER["PHP_SELF"]."?".$str;
		}
	}
?>